Lock detector for switched reluctance machine rotor position est

Details Lock detector for switched reluctance machine rotor position est Lock detector for switched reluctance machine rotor position est

1991-09-13

1992-08-18

Smith, Jr., David

Electricity: motive power systems

Synchronous motor systems

Hysteresis or reluctance motor systems

H02P 800

Patent

active

051402440

ABSTRACT:
A lock detector for a switched reluctance motor (SRM) position estimator monitors the rotor angle estimates from a SRM rotor position estimator to make sure that the estimator is accurately tracking rotor position. Phase flux and current measurements corresponding to the rotor angle estimate of the sampled phase are supplied to dividing circuitry which generates a phase inductance estimate. The phase inductance estimate is compared by logic circuitry to lower and upper inductance limits to determine whether the rotor angle estimate falls within a specified tolerance of a theoretical inductance value. Alternatively, a flux-current map is used to generate a phase flux reference for comparison to the phase flux estimate. A lock detector flip-flop is reset whenever the phase inductance estimate (or phase flux estimate) is outside the specified tolerance, and a signal is sent thereby to disable the SRM.

REFERENCES:
patent: 4470000 (1984-09-01), Hienle
patent: 4739240 (1988-04-01), MacMinn et al.
patent: 4772839 (1988-09-01), MacMinn et al.
patent: 4959596 (1990-09-01), MacMinn et al.
patent: 4961038 (1990-10-01), MacMinn

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